pell-mell (adjective) - 1 : in mingled confusion or disorder; 2 : in confused haste
Example:
The children came tearing through the room, knocking over the lamp, tipping over chairs, and scattering papers pell-mell all over the floor.

Tidbit:
The word "pell-mell" was formed through a process called "reduplication." The process -- which involves the repetition of a word or part of a word, often including a slight change in its pronunciation -- also generated such terms as "bow-wow," "helter-skelter," "flip-flop," and "walkie-talkie." Yet another product of reduplication is "shilly-shally," which started out as a single-word compression of the question "Shall I?" "Pell-mell" traces to the Middle French "pelemele" which has the same meaning as the English "pell-mell."

Kudos to Merriam-Webster's online dictionary - www.m-w.com